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EP0728356B1 - Structure d'un element de serrage de disque a paroi elevee - Google Patents

Structure d'un element de serrage de disque a paroi elevee Download PDF

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Publication number
EP0728356B1
EP0728356B1 EP95901127A EP95901127A EP0728356B1 EP 0728356 B1 EP0728356 B1 EP 0728356B1 EP 95901127 A EP95901127 A EP 95901127A EP 95901127 A EP95901127 A EP 95901127A EP 0728356 B1 EP0728356 B1 EP 0728356B1
Authority
EP
European Patent Office
Prior art keywords
clamp
disk
recited
annular section
storage media
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP95901127A
Other languages
German (de)
English (en)
Other versions
EP0728356A1 (fr
Inventor
Christopher Briggs
Jia-Kuen Jerry Lee
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Seagate Technology LLC
Original Assignee
Seagate Technology LLC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Seagate Technology LLC filed Critical Seagate Technology LLC
Publication of EP0728356A1 publication Critical patent/EP0728356A1/fr
Application granted granted Critical
Publication of EP0728356B1 publication Critical patent/EP0728356B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B17/00—Guiding record carriers not specifically of filamentary or web form, or of supports therefor
    • G11B17/02—Details
    • G11B17/038—Centering or locking of a plurality of discs in a single cartridge

Definitions

  • the present invention relates to a data storage device, and more particularly, to a structure for securing one or more disks within a disk drive, the structure exerting a clamping force which is substantially uniformly distributed around the disk.
  • Winchester type disk drives operate by positioning a read/write transducing head over respective tracks on a rotating magnetic storage disk. Positioning of the head over the tracks is accomplished by an actuator coupled to control electronics, which control the positioning of the actuator and the read/write functions of the heads.
  • the flying height does not remain constant, but rather tends to fluctuate slightly above and below the normal flying height. At lower flying heights, a variation in the fly height may cause the head to randomly contact the disk surface. This situation is referred to as intermittent contact.
  • flying heights have been reduced to the point where intermittent contact with the disk surface has become an important consideration in the tribology of the head/disk interface. Repeated intermittent contact between the head and a particular location on the disk surface can cause damage to the head and/or disk, and may cause drive failure in an unreasonably short period of time.
  • disk clamps pose significant disk distortion problems relates to the manner in which the clamp secures a disk within the disk drive.
  • the disk is provided on a cylindrical hub which is affixed to the rotor of the spin motor.
  • a clamp is provided on top of the hub, and has a larger radius than the hub such that an outer circumferencial portion of the clamp is in contact with the disk.
  • a plurality of screws fit through holes around an inner circumferencial portion of the clamp, and into threaded bores in the hub. Conventionally, anywhere from three to eight screws are used in this type of clamp configuration. In smaller disk drives which do not require a large clamping force, a clamp having a single screw through the center of the clamp may be used.
  • the force exerted by the disk clamp at the circular line of contact defined between the clamp and disk should be uniform around the entire line of contact.
  • the concentrated force of the screws securing the clamp to the hub result in localized stresses at points around the line of contact located radially outward from the screws. These localized stresses tend to distort the disk. The stresses are greatest near the inner diameter of the disk, and tend to dissipate toward the outer diameter of the disk, so as to create distortion in the disk similar to patterns 10 on Figure 1.
  • the peak to valley distortion of the disk due to non-uniform clamping force may be as high as 10 to 20 microns. Since read/write heads are presently flying at normalised surface heights of less than approximately 1.016 x 10 -7 m(4 ⁇ "), it is clear that flying the head near the inner diameter of the disk will result in severe and repeated intermittent contact of the head with the high points of the disk, which may result in damage to the head and/or disk and drive failure in an unreasonably short period of time.
  • US-A-5 089 922 discloses a clamping device designed to maintain the alignment between the clamp and the hub as greater clamping forces are applied.
  • DE-A-4 214 127 discloses an improved method of assembly for a disk drive which requires a clamping ring formed with a middle section of decreased stiffness which acts as a spring.
  • the drive includes a disk clamp for clamping one or more disks within the disk drive, with the clamp exerting a substantially uniform pressure at the circular line of contact between the clamp and the disk.
  • the disk clamp includes a raised circular wall around an outer radius of the clamp, which wall is formed as part of and integrally with the rest of the clamp. The wall serves to increase the structural rigidity of the clamp in a single axial section of the clamp, thereby providing a "stress barrier" to the transmission of localized stresses from the screw points. That is, the wall is provided to present the localized stresses created at the screw points from being transmitted to the disk.
  • the wall is positioned at a diameter which is larger than the diameter of the clamping screws, but smaller than the diameter of the line of the contact defined between the clamp and disk. Positioned as such, the wall is able to evenly distribute the localized stress emanating from the screws, so that the pressure of the clamp on the disk at the line of contact is substantially uniform around the entire clamp. Thus, the distortion normally occurring at the inner diameter of the disk with conventional disk clamps is greatly reduced.
  • Figs. 1-5c relate to a disk drive with a novel disk clamping design.
  • the clamp design may be used with 21 ⁇ 2 and 31 ⁇ 2 inch form factor disk drives.
  • the present invention may operate with disk drives of various sizes and designs, as well as other types of data storage devices, such as optical and laser storage systems.
  • a disk drive 20 including a storage disk 22 and a read/write head 24.
  • Read/write head 24 includes a transducer 25 mounted to a slider 26.
  • the slider 26 is in turn supported on actuator arm 28.
  • Transducer 25 may be a conventional inductive transducing element, or in a alternative embodiment, may be a magneto-resistive (MR) transducing element.
  • Disk drive 20 further includes an actuator 28, which is provided to pivot around pin 30 by voice coil motor 32 in response to control signals received from a printed circuit board (not shown). As is known in the art, during operation of the drive 20, disk 22 is rotated by a spin motor 44 (Fig.
  • Slider 26 is provided to fly a very small distance above the surface of disk 22 as disk 22 rotates.
  • the head may have a flying height between 2.54 to 10.16 x 10 -8 m (1-4 ⁇ "), and optimally about 6.35 x 10 -8 m (2.5 ⁇ ").
  • disk drive 20 further includes a disk clamp 40 for clamping the disks 22.
  • disk clamp 40 for clamping the disks 22.
  • two disks 22 are shown. It is understood, however, that the present invention may utilize one or more disks 22.
  • disks 22 fit over a hub 42, and are separated and held in parallel relation to each other by means of an annular spacer 43.
  • the hub is adjacent to a spin motor generally shown at 44.
  • the spin motor is comprised of a magnetic rotor 46 and stationarily mounted stator windings 48.
  • the hub 42 is affixed to the rotor 46, with the hub 42 and rotor 46 both rotatably supported on bearings 50a and 50b to allow rotation of the hub and rotor as a singular unit.
  • commutation of an electrical current through windings 48 will cause the rotor 46 to rotate, thus rotating disks 22. It is understood to be within the scope of the invention that various other structures may be substituted for the structures described above for supporting and rotating the disks 22 as is known in the art.
  • the clamp is preferably an annular member comprised of aluminium or a comparably rigid and durable material, with an inner diameter of approximately 1.524 x 10 -2 m (mm) (0.6 inches) and an outer diameter of approximately 3.3 x 10 -2 m (1.3 inches).
  • Fig. 5a which is a cross-sectional view through line 5-5 of Fig. 4, shows a rounded lower surface 60 at an outer circumferencial section of the clamp.
  • the surface 60 may be an arc rounded about a radius of approximately 5.842 x 10 -2 m (0.23 inches).
  • the rounded surface 60 has a portion 62 (Figs. 3 and 5a) in contact with the upper surface of the top disk 22.
  • the contact portion 62 around the entire clamp 40 generally defines a circular line of contact having a diameter of approximately 3.048 x 10 -2 m (1.2 inches).
  • the line of contact defined between the clamp and disk should be at substantially the same diameter as the line of contact defined between the disks 22 and the spacer 43.
  • the disk spacer 43 defines a line of contact with the disks approximately half-way between the inner and outer diameters of the spacer.
  • the disk clamp is preferably configured to define a line of contact which aligns at the same diameter as the spacer line of contact. In embodiments having multiple spacers, each line of contact defined between a disk and spacer should be at substantially the same diameter as the disk clamp line of contact.
  • Clamp 40 may further include a plurality of screw holes 64 which align with threaded bores in the hub 42.
  • screws 68 (Figs. 2 and 3) fit through holes 64 into the hub 42 to secure the clamp 40 and disks 22 within the drive 20.
  • screws 68 must be tightened under a considerable force to prevent any slippage or tilting of disks 22.
  • the screws are torqued to about 4.8 x 10 -2 Nm (4.2 pound-inches)).
  • the screw holes may be evenly spaced around a circumference of the clamp 40, and include centre points lying on circle having a diameter of approximately 1.956 x 10 -2 m (0.77) inches.
  • the clamp 40 includes eight screw holes 64, but the number of screw holes may vary in alternative embodiments. It is further contemplated that the disks may be secured within the drive by using less screws 68 than there are screw holes 64.
  • the clamp 40 may additionally include an elevated circular wall 66 to act as a stress barrier.
  • the wall 66 is provided at a diameter between the line of contact defined by contact portion 60 and the diameter at which the screw holes 64 are located.
  • the wall 66 may preferably have a height of about 1.78 x 10 -3 m (0.07 inches), and inner and outer diameters or approximately 2.413 x 10 -2 m (0.95 inches) and 2.718 x 10 -2 m (1.07 inches), respectively, thus defining a wall thickness of approximately 3.05 x 10 -3 m (0.12 inches).
  • the wall 66 is formed as part of and integrally with the clamp 40 for the purpose of adding structural rigidity to an axial section of the clamp 40.
  • the wall 66 is shown as having a substantially rectangular configuration round the clamp, it is understood that the wall may be configured differently in other embodiments.
  • the wall may be an elevated section with rounded edges.
  • the wall 66 may be formed by creating a fold in clamp 60.
  • further configurations of the wall 66 are possible.
  • the embodiment shown in Fig. 5c offers an advantage that it is easily and inexpensively manufacturable.
  • wall 66 acts as a stress barrier by increasing the rigidity of a single axial section of the clamp relative to the rest of the clamp.
  • wall 66 acts as a stress barrier, such that localized stresses emanating from the screw points reach the wall 66 and are uniformly distributed around the wall.
  • sections of the clamp at a diameter outside of the wall 66 receive a uniform pressure distribution. This allows clamp 40 to exert a relatively uniform pressure on disk 22 around the entire periphery of the clamp, and distortion of the disk is substantially avoided.
  • a pressure sensitive sheet such as carbon paper
  • a test sheet to pick up the markings made by the pressure sensitive sheet
  • the pressure sensitive carbon paper made markings on the test sheet which were proportionate to the amount of pressure exerted on the pressure sensitive sheet.
  • Fig. 6a shows the results obtained with the conventional disk clamp. The heavier markings are located radially outward from the four screw points. As can be seen, there is greater pressure exerted on the disk radially outward from the screw points.
  • Fig. 6b shows the results obtained using a disk clamp according to the present invention. The pressure distribution around the line of contact is relatively uniform. Figs. 6a and 6b are not the actual test results obtained in the above-described tests, but are accurate reproductions thereof.
  • the clamp according to the present invention was shown to evenly distribute the clamping forces generated at the screw points to thereby greatly prevent distortion of the disk.
  • the head 24 may fly near the inner diameter of the disk at extremely low flying heights, for example 5.08 x 10 -8 m (2 ⁇ "), without repeated intermittent contact of the head with the same locations on the disk.
  • damage to the head 24 and/or disk 22 may be avoided and the life of the disk drive prolonged.

Landscapes

  • Holding Or Fastening Of Disk On Rotational Shaft (AREA)

Claims (17)

  1. Unité de disques (20) comprenant :
    un boítier ;
    des supports d'informations (22) à l'intérieur dudit boítier pour stocker des données ;
    un transducteur (25) servant à transférer les données vers lesdits supports d'informations (22) et depuis ces derniers ;
    un élément de serrage (40) annulaire adjacent aux dits supports d'informations (22) et servant à serrer lesdits supports d'informations (22) à l'intérieur dudit boítier ;
    un moyen d'actionnement (28) servant à positionner ledit transducteur (25) par rapport aux dits supports d'informations (22) ; et
    un dispositif électronique de contrôle servant à contrôler ledit transfert de données et à contrôler ledit positionnement dudit moyen d'actionnement (28),
    l'unité de disques étant caractérisée en ce que
    ledit élément de serrage (40) comprend une première section annulaire et une deuxième section annulaire située radialement à l'extérieur de ladite première section annulaire, ladite deuxième section annulaire incluant une surface de dessus sensiblement plane et une surface de dessous (62) sensiblement arquée, ladite surface de dessous (62) sensiblement arquée étant en contact avec un support d'informations desdits supports d'informations (22), et ledit élément de serrage (40) comprenant une troisième section annulaire située radialement entre lesdites première et deuxième sections annulaires, ladite troisième section annulaire ayant une rigidité plus grande par rapport aux dites première et deuxième sections annulaires ; et par
    une pluralité de trous (64) prévus autour de ladite première section annulaire dudit élément de serrage (40) et adaptés pour recevoir un moyen à visser (68) afin d'immobiliser lesdits supports d'informations (22) dans une relation fixe par rapport au dit transducteur (25), ladite troisième section annulaire empéchant que des tensions localisées (10) provenant de ladite pluralité de trous (64) et des moyens à visser (68) soient transmises dans lesdits supports d'informations (22).
  2. Unité de disques (20) selon la revendication 1, dans laquelle ladite troisième section annulaire comprend une paroi élevée (66) concentrique avec un diamètre intérieur dudit élément de serrage (40), ladite paroi (66) formant une partie intégrale dudit élément de serrage (40) et ayant une hauteur supérieure aux dites première et deuxième sections annulaires dudit élément de serrage.
  3. Unité de disques (20) selon la revendication 2, dans laquelle ladite paroi (66) a une section transversale sensiblement rectangulaire mesurant approximativement 1,778 x 10-3 m (0,07 pouce) de hauteur et approximativement 3,048 x 10-3 m (0,12 pouce) d'épaisseur radiale.
  4. Unité de disques (20) selon la revendication 2, dans laquelle ladite paroi (66) possède une partie de dessus pourvue d'une section transversale sensiblement arrondie.
  5. Unité de disques (20) selon la revendication 2, dans laquelle ladite paroi (66) est formée par un pli saillant dans ledit élément de serrage (40).
  6. Unité de disques (20) selon la revendication 1, dans laquelle ledit élément de serrage est formé en aluminium.
  7. Unité de disques (20) selon la revendication 1, dans laquelle ledit transducteur (25) parcourt lesdits supports d'informations (22) à une hauteur supérieure ou égale à 2,54 x 10-8 m (un micropouce (1µ")) et inférieure ou égale à 1,016 x 10-7 m (quatre micropouces (4µ")).
  8. Unité de disques (20) selon la revendication 7, dans laquelle ledit transducteur (25) parcourt lesdits supports d'informations (22) à une hauteur de 6,35 x 10-8 m (deux micropouces et demi (2,5µ")).
  9. Unité de disques (20) selon la revendication 1, comprenant, en outre :
    au moins un élément d'écartement (43), un espace dudit - au moins un - élément d'écartement prévu pour séparer chaque paire de supports d'informations adjacents desdits supports d'informations (22), une ligne de contact entre ledit élément de serrage et lesdits supports d'informations définissant un diamètre qui est sensiblement identique à chaque diamètre défini par la ligne de contact entre ledit - au moins un - élément d'écartement et chacun desdits supports d'informations.
  10. Elément de serrage (40) de disque/s pour serrer un ou plusieurs disque(s) (22) à l'intérieur d'une unité de disques (20), comprenant
    une première section annulaire ;
    une deuxième section annulaire située radialement à l'extérieur de ladite première section annulaire, ladite deuxième section annulaire incluant une surface de dessus sensiblement plane et une surface de dessous (62) sensiblement arquée, ladite surface de dessous (62) sensiblement arquée étant adaptée pour entrer en contact avec le disque situé sur le dessus parmi le ou les disque(s) (22) ;
    une troisième section annulaire située radialement entre lesdites première et deuxième sections annulaires, ladite troisième section annulaire ayant une rigidité plus grande par rapport aux dites première et deuxième sections de l'élément de serrage (40) ; et
    une pluralité de trous (64) prévus autour de ladite première section annulaire dudit élément de serrage (40) et adaptés pour recevoir un moyen à visser (68) afin d'immobiliser le ou les disque(s) (22) à l'intérieur de l'unité de disques (20), ladite troisième section annulaire empêchant que des tensions localisées (10) provenant de ladite pluralité de trous (64) et des moyens à visser (68) soient transmises dans lesdits un ou plusieurs disque(s) (22).
  11. Elément de serrage de disque(s) selon la revendication 10, dans lequel ladite troisième section annulaire comprend une paroi élevée (66) dont la hauteur est supérieure aux sections adjacentes de l'élément de serrage (40) et qui est concentrique avec un diamètre intérieur dudit élément de serrage (40), ladite paroi (66) formant une partie intégrale dudit élément de serrage (40).
  12. Elément de serrage (40) de disque(s) selon la revendication 11, dans lequel ladite paroi (66) a une section transversale sensiblement rectangulaire mesurant approximativement 1,778 x 10-3 m (0,07 pouce) de hauteur et approximativement 3,048 x 10-3 m (0,12 pouce) d'épaisseur radiale.
  13. Elément de serrage (40) de disque(s) selon la revendication 10, dans lequel ladite troisième section annulaire inclut une paroi annulaire élevée (66) dont la hauteur est supérieure aux dites première et deuxième sections de l'élément de serrage (40).
  14. Elément de serrage (40) de disque(s) selon la revendication 13, dans lequel ladite paroi (66) a une section transversale sensiblement rectangulaire mesurant approximativement 1,778 x 10-3 m (0,07 pouce) de hauteur et approximativement 3,048 x 10-3 m (0,12 pouce) d'épaisseur radiale.
  15. Elément de serrage (40) de disque(s) selon la revendication 13, dans lequel ladite paroi (66) possède une partie de dessus pourvue d'une section transversale sensiblement arrondie.
  16. Elément de serrage (40) de disque(s) selon la revendication 13, dans lequel ladite paroi (66) est formée par un pli saillant dans ledit élément de serrage.
  17. Elément de serrage (40) de disque(s) selon la revendication 13, dans lequel l'élément de serrage (40) est formé en aluminium.
EP95901127A 1993-11-08 1994-11-07 Structure d'un element de serrage de disque a paroi elevee Expired - Lifetime EP0728356B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/148,385 US5490024A (en) 1993-11-08 1993-11-08 Disk clamp having an annular section of increased rigidity
US148385 1993-11-08
PCT/US1994/012673 WO1995013614A1 (fr) 1993-11-08 1994-11-07 Structure d'un element de serrage de disque a paroi elevee

Publications (2)

Publication Number Publication Date
EP0728356A1 EP0728356A1 (fr) 1996-08-28
EP0728356B1 true EP0728356B1 (fr) 2000-03-29

Family

ID=22525547

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95901127A Expired - Lifetime EP0728356B1 (fr) 1993-11-08 1994-11-07 Structure d'un element de serrage de disque a paroi elevee

Country Status (5)

Country Link
US (1) US5490024A (fr)
EP (1) EP0728356B1 (fr)
JP (1) JP2763680B2 (fr)
DE (1) DE69423774T2 (fr)
WO (1) WO1995013614A1 (fr)

Families Citing this family (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5732458A (en) * 1995-04-14 1998-03-31 Seagate Technology, Inc. Process for assembling a clamp ring to a disk stack assembly
KR970008091A (ko) * 1995-07-13 1997-02-24 김광호 하드 디스크 드라이버의 디스크 체결 장치
JP2856700B2 (ja) * 1995-09-27 1999-02-10 インターナショナル・ビジネス・マシーンズ・コーポレイション デイスク装置
US5790346A (en) * 1996-06-28 1998-08-04 Western Digital Corporation Disk clamp for a disk drive for evenly distributing clamping force on recording medium
US5912784A (en) * 1996-11-19 1999-06-15 Seagate Technology, Inc. Dual member disc clamp for uniform clamping load distribution
JP4027499B2 (ja) * 1998-05-18 2007-12-26 富士通株式会社 記録ディスク装置および押し付けクランプ
US6304412B1 (en) 1999-05-12 2001-10-16 Maxtor Corporation Disk drive with interlocking disk clamp
US6417988B1 (en) 1999-10-12 2002-07-09 Seagate Technologh Llc Disc clamp for a disc drive
KR100458633B1 (ko) * 1999-10-12 2004-12-03 시게이트 테크놀로지 엘엘씨 하중을 균일하게 감쇄시키는 디스크 클램프
US6724568B1 (en) 2000-07-13 2004-04-20 Maxtor Corporation Disk clamp for disk drive
US6563668B1 (en) 2000-10-10 2003-05-13 Maxtor Corporation Integrated spacer clamp for disk drive
US6816338B1 (en) 2001-07-09 2004-11-09 Maxtor Corporation Disk clamp with one or more load distributing, balancing and/or stabilizing grooves
US6788495B2 (en) 2002-03-11 2004-09-07 Seagate Technology Llc Disc pack assembly
US6703584B2 (en) 2002-05-13 2004-03-09 Seagate Technology Llc Disc clamp adjustment using heat
KR100468754B1 (ko) * 2002-07-19 2005-01-29 삼성전자주식회사 하드 디스크 드라이브의 디스크 클램프
US7307813B1 (en) * 2003-10-07 2007-12-11 Maxtor Corporation Apparatuses and methods for improving disk pack balancing in disk drives including methods for centering disk clamps
SG125940A1 (en) * 2004-03-12 2006-10-30 Seagate Technology Llc Disc media retainer
US7239476B2 (en) * 2004-05-12 2007-07-03 Hitachi Global Storage Technologies Netherlands B.V. System, method, and apparatus for distributing stress with one or more cavities in a disk clamp for disk drive applications
US20070133124A1 (en) * 2005-12-08 2007-06-14 Samsung Electronics Co., Ltd. Disk clamp and hard disk drive including the same
US8824098B1 (en) 2006-09-19 2014-09-02 Western Digital Technologies, Inc. Belleville disk clamp
US9019655B1 (en) 2014-06-25 2015-04-28 HGST Netherlands B.V. Hard disk drive disk clamp having reduced radial stiffness
US11955139B2 (en) * 2022-04-27 2024-04-09 Western Digital Technologies, Inc. Hard disk drive multiple contact disk spindle motor hub flange
US11935560B2 (en) * 2022-04-27 2024-03-19 Western Digital Technologies, Inc. Hard disk drive multiple contact disk clamp

Family Cites Families (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3768083A (en) * 1972-08-10 1973-10-23 Information Storage Systems Baseplate assembly for a disc drive
US4224648A (en) * 1978-10-16 1980-09-23 Control Data Corporation Disc centering
JPS55157166A (en) * 1979-05-23 1980-12-06 Hitachi Ltd Magnetic disc driving unit
JPS5629842A (en) * 1979-08-10 1981-03-25 Hitachi Ltd Nonspacer disc
US4367503A (en) * 1980-12-24 1983-01-04 International Business Machines Corporation Fermetically sealed disk file
US4458282A (en) * 1981-10-26 1984-07-03 Hewlett-Packard Company Media module
US4561035A (en) * 1982-07-21 1985-12-24 Sperry Corporation Method and apparatus for clamping and balancing rotatable members
JPS60136055A (ja) * 1983-12-23 1985-07-19 Mitsubishi Electric Corp 磁気デイスク円板の取付構造
JPS61194686A (ja) * 1985-02-22 1986-08-29 Alps Electric Co Ltd 磁気記録・再生装置
JPS632183A (ja) * 1986-06-20 1988-01-07 Fujitsu Ltd 磁気デイスクの固定機構
JPS6374164A (ja) * 1986-09-17 1988-04-04 Hitachi Ltd 磁気デイスク装置
US4835637A (en) * 1987-09-08 1989-05-30 International Business Machines Corporation Disk file with in-hub motor
US4933785A (en) * 1988-03-01 1990-06-12 Prairietek Corporation Disk drive apparatus using dynamic loading/unloading
GB2230891B (en) * 1988-07-18 1992-04-08 Seagate Technology Disc clamp
US4893205A (en) * 1988-07-18 1990-01-09 Seagate Technology, Inc. Flexure mount for disc drives
US5031061A (en) * 1989-09-27 1991-07-09 Quantum Corporation Disk drive hub assembly
US5101306A (en) * 1989-10-30 1992-03-31 Kabushiki Kaisha Toshiba Releasable controlled force clamp for disk storage apparatus
US5089922A (en) * 1990-07-31 1992-02-18 Seagate Technology, Inc. Disc drive motor spindle hub for holding a disc and spacer stack firmly in place
US5212607A (en) * 1990-07-31 1993-05-18 Seagate Technology, Inc. Disk drive including unitary deck for aligning and supporting axially retractable spindle assembly
US5148338A (en) * 1990-11-14 1992-09-15 Digital Equipment Corporation Disk drive spindle hub assembly
US5136450A (en) * 1991-01-10 1992-08-04 Seagate Technology, Inc. Disc pack assembly having a laminate sleeve disposed between a spindle and a disc, for reducing radial disc displacement
JPH04330695A (ja) * 1991-05-01 1992-11-18 Hitachi Ltd 磁気ディスク装置の組立方法

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Publication number Publication date
JP2763680B2 (ja) 1998-06-11
WO1995013614A1 (fr) 1995-05-18
DE69423774T2 (de) 2000-07-27
US5490024A (en) 1996-02-06
EP0728356A1 (fr) 1996-08-28
JPH09503331A (ja) 1997-03-31
DE69423774D1 (de) 2000-05-04

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